SignalTap Invalid jtag (completely wiring dependent)

Below are some links for suggestions:

https://www.intel.com/content/www/us/en/programmable/quartushelp/current/index.htm#msgs/msgs/esedq_jtag_err_no_hardware.htm

https://www.intel.com/content/www/us/en/programmable/quartushelp/current/index.htm#msgs/msgs/ibnlq_invalid_jtag_configuration.htm

https://www.intel.com/content/www/us/en/programmable/quartushelp/current/index.htm#msgs/msgs/iredq_invalid_jtag_configuration.htm

https://www.intel.com/content/www/us/en/programmable/quartushelp/current/index.htm#msgs/msgs/isedq_invalid_jtag_configuration.htm

Also make sure to recompile and reprogram after making any changes.

Try to Scan Chain as well.

Thanks,

Best regards,

Sheng

When you say Signal Tap is not reliable, what exactly do you mean? Are you saying the captured samples don't match what you expect or is it not triggering on the trigger conditions you've specified? How full is your device? When you say that the design is meeting timing, is it meeting timing with Signal Tap both enabled and disabled?

Hi sstrell,

Thanks for your attention.

I've never seen or captured samples mismatch, or no triggering.

My "reliable" means "Invalid JTAG Chain", the device is never more than 60% filled. Meeting timing means no timing error other than unconstrained warnings (those are expected with SignalTap insertions).

Basically, as long as I am able to see SignalTap after programming. I am happy. There is 10% percent chances I don't see it. Tried clean, rebuild. noprune attributes, all sorts. Most of the time, I had to use alternative method or nets to get moving.

Regards,

Ah, thought it was in the design. So you're probably having issues with programming the device itself as well.

There's a JTAG Chain Debugger tool in Quartus you could try. That might help identify a board issue, especially if there are other devices on your JTAG chain.

Weird. Is this a dev kit or a custom board? Can you try a different device? Does this happen with different designs? Could be a flaky device.